import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../components/Login.vue'
import Home from '../components/Home.vue'

Vue.use(VueRouter)

const routes = [
  { path: '/', redirect: '/login' },
  { path: '/login', component: Login },
  { path: '/home', component: Home }
]

const router = new VueRouter({
  routes
})

//路由导航守卫，为路由对象添加beforeEach 导航守卫
router.beforeEach((to, from, next) => {
  //如果用户访问登录页面，直接放行
  if(to.path === '/login')
    return next()

  //从sessionStorage中获取到保存的token值
  const tokenStr = window.sessionStorage.getItem('token')
  //没有token，强制跳转到登录页面
  if(!tokenStr) return next('/login')

  next();
  
})

export default router
